What should be practiced for safe water entry during training?

Practicing safe water entry during training is essential for preventing injuries and ensuring a safe environment for all participants. Using a proper diving technique is crucial because it minimizes the risk of hitting the bottom or obstacles in the water, which can lead to serious injury.

When entering the water head-first, extending the arms overhead serves multiple purposes. It streamlines the body, reducing resistance as the swimmer enters the water, and helps protect the head and neck by ensuring that the head follows the line of the body's entry. This technique also allows swimmers to assess the depth of the water before entering, ensuring a safer dive.

The other options present risks; entering the water at high speed can lead to a lack of control and is more likely to result in an injury upon impact with the water's surface or any hidden items beneath. Waiting for a signal before entering is important for organizational safety but does not directly pertain to the techniques of safe water entry during an actual dive. Thus, emphasizing the correct technique during entry is vital for ensuring the safety of all swimmers in training.